Controlled ectomycorrhization of an exotic legume tree species Acacia holosericea affects the structure of root nodule bacteria community and their symbiotic effectiveness on Faidherbia albida, a native sahelian Acacia
| Autor: | Jean Thioulouse, Aliou Faye, Mansour Thiao, Ibrahima Ndoye, Antoine Galiana, Yves Prin, Robin Duponnois, Bernard Dreyfus, Tatiana Krasova-Wade, Marc Neyra |
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| Jazyk: | angličtina |
| Rok vydání: | 2009 |
| Předmět: |
Root nodule
Ectomycorrhizal symbiosis Symbiose Soil Science Acacia F62 - Physiologie végétale - Croissance et développement Pisolithus Pisolithus albus Microbiology Exotic tree species F62 - Physiologie végétale : croissance et développement Rhizobia food Faidherbia albida Botany Bradyrhizobia Acacia holosericea Bradyrhizobium Mycorrhiza Mycorhizé biology P35 - Fertilité du sol P34 - Biologie du sol Native plant biology.organism_classification Soil microbial communities food.food K10 - Production forestière Ectomycorhize |
| Zdroj: | Soil Biology and Biochemistry The 13th Congress of the African Association for Biological Nitrogen Fixation, satellite workshop on Mycorrhiza, December 15th-18th 2008, Hammamet, Tunisia : book of abstracts |
| Popis: | Many fast growing tree species have been introduced to promote biodiversity rehabilitation on degraded tropical lands. Although it has been shown that plant productivity and stability are dependent on the composition and functionalities of soil microbial communities, more particularly on the abundance and diversity of soil symbiotic micro-organisms (mycorrhizal fungi and rhizobia), the impact of tree introduction on soil microbiota has been scarcely studied. This research has been carried in a field plantation of Acacia holosericea (Australian Acacia species) inoculated or not with an ectomycorrhizal fungus isolate, Pisolithus albus IR100. After 7 year's plantation, the diversity and the symbiotic properties of Bradyrhizobia isolated from the plantation soil or from the surrounding area ( Faidherbia albida (Del.) a. Chev. parkland) and able to nodulate F. albida , a native Sahelian Acacia species, have been studied. Results clearly showed that A. holosericea modified the structure of Bradyrhizobia populations and their effectiveness on F. albida growth. This negative effect was counterbalanced by the introduction of an ectomycorrhizal fungus, P. albus , on A. holosericea root systems. In conclusion, this study shows that exotic plant species can drastically affect genotypic and symbiotic effectiveness of native Bradyrhizobia populations that could limit the natural regeneration of endemic plant species such as F. albida . This effect could be counterbalanced by controlled ectomycorrhization with P. albus . These results have to be considered when exotic tree species are used in afforestation programs that target preservation of native plants and soil ecosystem rehabilitation. |
| Databáze: | OpenAIRE |
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